Mini Digital Voltmeter,
This is not an incredibly accurate meter, with resolution of 0.1 V, but it's an inexpensive way
to quickly see the battery voltage on your Robot or RaceCar or your Motor Vehicle battery. It is
easy to use: The meter has a 2 contact JST female receptacle and it comes with a male JST wired with
3-4" red and black pigtails.
Mounting Hole size: 45.5mm * 26.5mm
Dimensions: 48mm * 29mm * 21mm
Display: three 0.56 LED display
Refresh rate: about 500ms
Measurement accuracy: 1% (+ / - 1 count)
Supply voltage: DC4.0-30V (Same as measured voltage)
Connections: Ground / Common: Black, + 4.5 to 30 VDC Power: Red
DTMF Decoder Kit
Complete 8870-based DTMF Decoder Chip Kit - Includes all parts needed to add a DTMF decode to a micro:
either a Zarlink MT8870D chip or Clare M8870-01 in PDIP-18 package, color burst crystal, DIP socket, three precision
resistors and 2 caps
This is a hard to find item in small quantities. No bulk sales. Limit three per customer per order.
LM4889 Audio Amplifier,
The Modern Device LM4889 audio amplifier breakout board uses one of National Semiconductor's "Boomer"
amps. It uses what in the industry is referred to as a "bridge-tied load". This is an efficient
system that increases the total amount of power available to the speaker. It also eliminates the need
for an output capacitor, (like in the LM386) which tends to be bulky and can limit the low-end response.
It has a shutdown pin to put the chip to sleep, just in case you're trying to build a super low-power
microcontroller application that spends most of its time sleeping.
This is probably not loud enough for a good dorm-room dance party but more than loud enough for a personal
With Vcc = 5V and 8 ohm speaker
.4 watts out has 1% THD
1 watt out has 2% THD
Modern Device Audio Amplifier Schematic(png)
Ships with a two pin, and a 4 pin male header, and a 200K pot which are all not soldered onto the
board. All other parts are assembled and tested and ready to go.
MiniBreadboard, top quality, standard .100" spacing, 17 rows of 5 hole and 5 holes, 170 total contact points, size
is 1.8" L by 1.35" W, peel off adhesive on base.
Single Panel Breadboard, top quality, standard .100" spacing, 830 total contact points, two terminal buss strips, size
is 6.5" L by 2.125" W
Breadboard Power Supply - by HVW Technology. 6-9 volt input, 5 volt output @ 500 ma. More current if
you heatsink the 7805 VR. Fits standard solderless breadboard power rails. Output polarities/pin assignments configurable.
Breadboard Wires - bundle of 75 wires of various lengths with male pins on each end
9 vdc/300 ma AC Power Supply - this a like-new "pull" from never
used equipment. It was designed to be plugged in 24/7. Has standard 18 ga wire with standard coaxial connector.
(Radio Shack Type "M" - 2.1 x 5.5 mm) May be used with the BreadBoard Power Supply above.
Stackable Connector Sets
Qty = 1
Qty = 2
Qty = 3
Arduino Set - 2 1x6 and 2 1x8 stackable connectors
Arduino (R3) Set - 1 1x6, 1 1x10, and 2 1x8 stackable connectors
Propeller Platform Set - 2 1x4 and 4 1x8 stackable connectors